Translating device



Feb. 27, 1923. 1,447,103. H. F. SCHMIDT.

TRANSLATING DEVICE. FILED MAY 3l, 1922.

' N y niy flmid WITNEssl-:s: j INVENTOR Patented Feb. 27, 1923.

UNITED HENRY E. SCHMIDT, OF PHILADELPHIA,

SYLVANIA.

PENNSYLVANIA, ASSIGNOR T0 WESTING- i ,HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION 0F PENN- TRANSLATING DEVICE.

Application filed May 31, 1922.

T o all whom it 'may con-cern.'

' Be it known that I, HENRY F; SCHMIDT,v

-the fluid to be translated is entrained by rapidl)1 moving motive fluid and is then discharged through a suitable diffuser in which a part of the kinetic energy imparted to the translated fluid by the motive fluid is converted into potential or pressure energy.

Ejectors are frequently employed f for pumping or circulating fluids of all kinds,

and in particular are commonly employed for removing air from condensers. In order to obtain a large area of entraining surface it is common practice ,to provide a large number of relatively small nozzles which are usually so arranged as to produce a large conical jet made up of the small jets discharged by the nozzles. The passages through such small nozzles are difficult to machine with sufficient.v accuracy toeensure that only the correct amount of motive fluid will be discharged through them. Furthermore. the proper construction and assembling of such an ejector is difficult because of the smallness of the parts and the accuracy with which they must be constructed and placed. Dirt also tends to clog up such small nozzles so as to render them more ,or less ineffective.

I have found that the same high efficiency, or even greater efficiency than has been attained with multiple nozzle ejectors may be obtained'with a much simpler ejector provvided the parts are arranged in accordance with my invention, as herein described and illustrated. I preferably employ but one nozzle and make the distance between the outlet of the nozzle and the-throat of the diffuser so great that the entraining area of the single jet is as effective as the total entraining area of the composite jet discharged by a group of smaller nozzles. They Serial No. 564,775.

thatthe highest efficiency is obtained when the distance between .the mouth of the nozzle and the throat of the diffuser is such that the effective area of the jet discharged by the nozzle is approximately five hundred times the area of the throat 'of the nozzle. `An ejector constructed in accordance with my invention is simple in construction, easy 4to machine and assemble andv is highly efficient 1n operation.

An object of my invention is to produce a new and improved ejector which is more simple and efficient than other ejectorslnow in use and known to me.

A'further object is to produce an ejector in which lan improved nozzle and diffuser arrangement is employed, having the advantages of well known and efficient multiple nozzle ejectors without the disadvantages characteristic of such ejectors. y

A further object is to produce a new and improved ejector in which one nozzle pro- -duces an entraining area as effective as is ordinarily obtainedwith a relatively large number of small nozzles.

A further object is to produce a new and scription of my invention are attained by4 means of apparatus herein described and illustrated in the drawing accompanying and forming a part/hereof. c.

The drawing is a diagrammatic sectional view of an ejector embodying thefeatures of my invention.

In the drawing I have illustrated an ejector having a converging combining tube 5 axially aligned with and. as sbown,joinedto a diverging diffuser tube 6. The junction of the combining tube and the diffuser is called the throat of `the eiector and is designated by the numeral 7. Communicating with theb large end of the combining tube 5. I have shown an inlet chamber 8 for fluids to be translated. an inlet port 9 being provided on one side thereof. Extending into the inlet chamber 8. I have illustrated a. nozzle 10 which. as shown. is adapted to receive motive Huid through a suitable inlet passage l and to discharge it in a jet ac-ross a part. of the inlet chamber 8 into the combining tube 5. The nozzle l0' has a contracted throat portion l2, and a diverging discharge portion 13, as is Well understood in the art to which my invention relaties.

Ars illustrated, the distance'l from the nozzle l() to the throat 7 issuch that the entraining area of the jet of motive fluid discharged by the nozzle l0 isy substantially five hundred times the transverse larea of the throat 12. l have found that this relation of areas gives the highest elhciency and enables the ejector to be constructed much cheaper and With greater simplicity than has hitherto been possibleI with ejectors intended for highly efficient operation.

ln operation the fluid to be translated is delivered to the inlet chamber 8. Motive fluid, for example steam, is delivered to the nozzle 10, which is preferably so proportioned as to expand the motive fluid to substantially `^thepressure existing in the inlet chamber 8. rTheI motive fluid is discharged from the no-zzle at high velocity and in the form of a jet. The fluid tohe translated is entrained b-y the jet of rapidly moving motive fluid and is carried through the combining tube 5 and the diffuser 6 in a manner well known to those skilled in the art. lt Will, of course, be understood that the. fluid to be translated fills upl the inlet chamber 8 and that part of the combining tube 5 which is not occupied b-y theI jet of motive fluid,

and therefore the full area orn the jet is in Contact with the fluid to be translated and this area is such thatthe highest efficiency is obtained.'l

While I have vshown my invention in Abut one form, it will be obvious. to those skilled yin the art that it isvnot so limited, but is susceptible of various other changes and modifications, without departing from the 1 spirit thereof, and I desire. therefore, that only such limitations shall be placed thereargine ior art or as upon as are imposed b-y the rr appended ing a throat, and a nozzle having a throat for delivering a jet of motive fluid into the diffuser, the jet having an area ot at least five hundred times the area of the throat of the nozzle.

ln an ejector, an inlet chamber for fluids to be translated, a combining cone communicating therewith, a diffuser for receiving the fluids vdischarged by the combining cone and connected thereto by a throat and a. nozzle for discharginga jet of motive lluid into the inlet chamber and the combining cone and provided with a throat, the nozzle being spaced Jfrom the throat ot' the diffuser such a distance that the effect-ive entraining area of the jet is substantially five hundred times the area of the nozzle throat.

Il. :l fluid translating device. comprising an inlet chamber for fluids to be translated, a converging-combining tube communicating therewith, a diffuser axially aligned with and connected toy the combining tube by a throat, and an expansion nozzle projecting linto said inlet chamber for delivering a jet of motive fluid having an effective entraining surface 'at least five hundred times as great as the area of the throat of the nozzle.

ln testimony whereof, l have hereunto subscribed my namev this 25th day of May, 1922.

Y HENRY F. SCHMDT. 

